Big Bang: Bang Bang Bang
Huh Gak - Hello
EXO - Peter Pan

I miss OT12 :'
Apink (에이핑크) - Good Morning Baby.

Justin Oh - We Own the World (feat. Amber & Luna of f(x))
I need to find more songs by this guy, seriously! I loved his one featuring Younha and now this one too! 

LU:KUS - So Into U
BANG BANG BANG of BIG BANG 
*Love in the eyes*

Boys Republic - Hello
This song really relaxes me. It's definitely made it onto my rainy day songs list.
Every single day - Rush (Gap dong ost)